The International C1200 uses a 198 bulb size for both front and rear turn signal applications. The replacement chart covers 1963 to 1964 model production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The bulb type 198 is an ANSI-standardized miniature wedge bulb classified under the T5 form factor, rated at 12 volts and 2 watts.
The T5 designation refers to the bulb's tubular shape, with the numerical suffix indicating its width in eighths of an inch, making it one of the smaller bulb formats used in automotive applications.
The 2-watt power rating of the 198 bulb places it at the low end of automotive bulb consumption, consistent with its use in signaling rather than illumination functions.
The International C1200 uses the 198 bulb for both front and rear turn signal positions across the 1963-1964 model years.
The ANSI standardization of the 198 bulb means it conforms to a defined specification recognized across the United States and Canada, which generally supports cross-brand availability.
The miniature wedge base of the 198 bulb is a baseless design that relies on the wedge-shaped glass pinch at its base to make electrical contact within the socket, with no separate metal base component.
The Light Duty classification noted in the specifications applies to both the front and rear turn signal positions for the 1963-1964 model years, indicating the vehicle trim or weight rating to which these fitments correspond.
The use of a single bulb type across all four turn signal positions on the International C1200 reflects a uniform fitment approach for the 1963-1964 model years.